<template>
  <el-table :data="formatData" :row-style="showRow" v-bind="$attrs" v-on="$listeners">
    <!-- 第一列展示、收缩图标展示更换，紧贴第2栏 -->
    <el-table-column v-if="columns.length===0" width="150">
      <template slot-scope="scope">
        <span v-for="space in scope.row._level" class="ms-tree-space" :key="space"></span>
        <span class="tree-ctrl" v-if="iconShow(0,scope.row)" @click="toggleExpanded(scope.$index)">
          <i v-if="!scope.row._expanded" class="el-icon-plus"></i>
          <i v-else class="el-icon-minus"></i>
        </span>
        {{scope.$index}}
      </template>
    </el-table-column>
    <el-table-column
      v-else        
      v-for="(column, index) in columns"
      :key="column.value"
      :label="column.text"
      :width="column.width">
      <template slot-scope="scope">
        <div class="pad-l-5 position-r" :class="'ctrl-' + scope.row._level">
          <span class="tree-ctrl" v-if="iconShow(index,scope.row)" @click="toggleExpanded(scope.$index)">
            <i v-if="!scope.row._expanded" class="el-icon-plus"></i>
            <i v-else class="el-icon-minus"></i>
          </span>
          {{scope.row[column.value]}}
        </div>
      </template>
    </el-table-column>
    <slot></slot>
  </el-table>
</template>

<script>
  /**
   Auth: Lei.j1ang
   Created: 2018/1/19-13:59
   */
  import treeToArray from './custom-eval'
  export default {
    name: 'treeTable',
    props: {
      data: {
        type: [Array, Object],
        required: true
      },
      columns: {
        type: Array,
        default: () => []
      },
      evalFunc: Function,
      evalArgs: Array,
      expandAll: {
        type: Boolean,
        default: false
      }
    },
    // 初始化页面
    created() {
      // console.log('goods-2222222')
    },
    computed: {
      // 格式化数据源
      formatData: function() {
        let tmp
        if (!Array.isArray(this.data)) {
          tmp = [this.data]
        } else {
          tmp = this.data
        }
        const func = this.evalFunc || treeToArray
        const args = this.evalArgs ? Array.concat([tmp, this.expandAll], this.evalArgs) : [tmp, this.expandAll]
        return func.apply(null, args)
      }
    },
    methods: {
      showRow: function(row) {
        const show = (row.row.parent ? (row.row.parent._expanded && row.row.parent._show) : true)
        row.row._show = show
        let styleJson = {}
        if (show) {
          styleJson = {}
        } else {
          styleJson = {
            'display': 'none'
          }
        }
        return styleJson
      },
      // 切换下级是否展开
      toggleExpanded: function(trIndex) {
        const record = this.formatData[trIndex]
        record._expanded = !record._expanded
        // 调父组件存储记录
        this.$emit('toggleExpanded', record.enterpriseCategoryId, record._expanded)
      },
      // 图标显示
      iconShow(index, record) {
        return (index === 0 && record.children && record.children.length > 0)
      }
    }
  }
</script>
<style rel="stylesheet/css">
  @keyframes treeTableShow {
    from {opacity: 0;}
    to {opacity: 1;}
  }
  @-webkit-keyframes treeTableShow {
    from {opacity: 0;}
    to {opacity: 1;}
  }
</style>

<style lang="scss" rel="stylesheet/scss" scoped>
  $color-blue: #2196F3;
  $space-width: 18px;
  .ms-tree-space {
    position: relative;
    top: 1px;
    display: inline-block;
    font-style: normal;
    font-weight: 400;
    line-height: 1;
    width: $space-width;
    height: 14px;
    &::before {
      content: ""
    }
  }
  .processContainer{
    width: 100%;
    height: 100%;
  }
  table td {
    line-height: 26px;
  }
  .ctrl-2{
    width: 16px;
    height: 16px;
    .tree-ctrl{
      position: absolute;
      left: 48px;
      top: 0;
      width: 16px;
      z-index: 1000;
    }
  }
  .tree-ctrl{
    cursor: pointer;
    color: $color-blue;
    // margin-left: -$space-width;
  }
</style>
